Noun
A pestering animal such as one that kills or harasses a farmer's livestock or crops.
(by extension) An obnoxious person or troublemaker.
Source: en.wiktionary.orgMan is the only kind of varmint sets his own trap, baits it, then steps in it. John Steinbeck
Swallowing a poisoned varmint is dangerous to one’s health, regardless of species. Source: Internet
The weight makes it easy to grab, go, and aim, necessary for late-night varmint visitors. Source: Internet